U.S. patent application number 16/508680 was filed with the patent office on 2019-11-07 for data receiving method, data sending method, receiving device, and sending device.
The applicant listed for this patent is HUAWEI TECHNOLOGIES CO., LTD.. Invention is credited to Bo FAN, You LI, Xiaoyong TANG.
Application Number | 20190342043 16/508680 |
Document ID | / |
Family ID | 62839298 |
Filed Date | 2019-11-07 |
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United States Patent
Application |
20190342043 |
Kind Code |
A1 |
FAN; Bo ; et al. |
November 7, 2019 |
DATA RECEIVING METHOD, DATA SENDING METHOD, RECEIVING DEVICE, AND
SENDING DEVICE
Abstract
Embodiments of the present invention provide a method for
receiving URLLC data from time-frequency resources. The method is
applied to a receiving device, the time-frequency resources include
eMBB data and the URLLC data, the time-frequency resources further
include an OFDM symbol, the OFDM symbol includes an indication
resource element RE, the indication RE indicates whether URLLC
control information exists in the OFDM symbol, and the method
includes: when the indication RE indicates that the URLLC control
information exists in the OFDM symbol, detecting the URLLC control
information in the OFDM symbol; and receiving the URLLC data based
on the detected URLLC control information.
Inventors: |
FAN; Bo; (Chengdu, CN)
; TANG; Xiaoyong; (Shenzhen, CN) ; LI; You;
(Chengdu, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HUAWEI TECHNOLOGIES CO., LTD. |
Shenzhen |
|
CN |
|
|
Family ID: |
62839298 |
Appl. No.: |
16/508680 |
Filed: |
July 11, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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PCT/CN2017/117534 |
Dec 20, 2017 |
|
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16508680 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L 1/16 20130101; H04L
5/0064 20130101; H04L 5/0007 20130101; H04L 5/0044 20130101; H04L
5/0053 20130101; H04L 5/0094 20130101; H04W 72/1289 20130101; H04L
1/0023 20130101; H04L 27/2698 20130101; H04L 27/34 20130101; H04L
27/2082 20130101 |
International
Class: |
H04L 5/00 20060101
H04L005/00; H04L 27/26 20060101 H04L027/26; H04L 27/20 20060101
H04L027/20 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 12, 2017 |
CN |
201710022855.8 |
Claims
1. A method for receiving ultra-reliable and low latency
communication (URLLC) data from time-frequency resources, by a
receiving device, wherein the time-frequency resources comprise
enhanced mobile broadband (eMBB) data and the URLLC data, the
time-frequency resources further comprise an orthogonal frequency
division multiplexing (OFDM) symbol, the OFDM symbol comprises an
indication resource element (RE), the indication RE indicates
whether URLLC control information exists in the OFDM symbol, the
method comprising: when the indication RE indicates that the URLLC
control information exists in the OFDM symbol, detecting the URLLC
control information in the OFDM symbol; and receiving the URLLC
data based on the detected URLLC control information.
2. The method according to claim 1, wherein the indication RE
indicates whether URLLC control information exists in the OFDM
symbol comprises: when the indication RE comprises a first data
symbol, the URLLC control information exists in the OFDM symbol; or
when the indication RE comprises a second data symbol, the URLLC
control information does not exist in the OFDM symbol.
3. The method according to claim 2, wherein the first data symbol
and the second data symbol are obtained after performing
lower-order modulation or higher-order modulation on data on the
indication RE.
4. The method according to claim 3, wherein the lower-order
modulation comprises BPSK, the first data symbol is 1, and the
second data symbol is 0; or the higher-order modulation comprises
16QAM or 64QAM, and the first data symbol is any data symbol other
than the second data symbol.
5. The method according to claim 1, wherein the indication RE
indicates whether URLLC control information exists in the OFDM
symbol comprises: when a value of energy on the indication RE is
greater than or equal to a preset threshold, the URLLC control
information exists in the OFDM symbol; or when a value of energy on
the indication RE is less than a preset threshold, the URLLC
control information does not exist in the OFDM symbol.
6. The method according to claim 5, wherein a system bandwidth of a
communications system to which the receiving device currently
belongs is divided into a plurality of subbands, and the indication
RE is on one of the plurality of subbands.
7. The method according to claim 1, wherein before the detecting
the URLLC control information in the OFDM symbol, the method
further comprises: receiving, from a sending device, a message
indicating a subcarrier on which the indication RE is located.
8. The method according to claim 1, wherein the OFDM symbol
comprises a search space specific to the receiving device, and when
the indication RE indicates that the URLLC control information
exists in the OFDM symbol, the URLLC control information is in the
search space.
9. The method according to claim 8, wherein the detecting the URLLC
control information in the OFDM symbol comprises: detecting the
URLLC control information in the search space in the OFDM
symbol.
10. The method according to claim 1, wherein the time-frequency
resources comprise a plurality of OFDM symbols, the OFDM symbol is
one of the plurality of OFDM symbols, each of the plurality of OFDM
symbols comprises one indication RE, the plurality of OFDM symbols
comprise a plurality of indication REs, and each of the plurality
of indication REs indicates whether URLLC control information
exists in an OFDM symbol in which the indication RE is located.
11. The method according to claim 10, wherein the plurality of
indication REs are all on a same subcarrier.
12. The method according to claim 10, wherein each of the plurality
of OFDM symbols comprises a search space specific to the receiving
device.
13. A receiving device, wherein the receiving device is configured
to receive ultra-reliable and low latency communication (URLLC)
data from time-frequency resources, the time-frequency resources
comprise enhanced mobile broadband (eMBB) data and the URLLC data,
the time-frequency resources further comprise an orthogonal
frequency division multiplexing (OFDM) symbol, the OFDM symbol
comprises an indication resource element (RE), the indication RE
indicates whether URLLC control information exists in the OFDM
symbol, the receiving device comprising: a detection unit,
configured to: when the indication RE indicates that the URLLC
control information exists in the OFDM symbol, detect the URLLC
control information in the OFDM symbol; and a first receiving unit,
configured to receive the URLLC data based on the detected URLLC
control information.
14. The receiving device according to claim 13, wherein the
indication RE indicates whether URLLC control information exists in
the OFDM symbol comprises: when the indication RE comprises a first
data symbol, the URLLC control information exists in the OFDM
symbol; or when the indication RE comprises a second data symbol,
the URLLC control information does not exist in the OFDM
symbol.
15. The receiving device according to claim 13, wherein the
indication RE indicates whether URLLC control information exists in
the OFDM symbol comprises: when a value of energy on the indication
RE is greater than or equal to a preset threshold, the URLLC
control information exists in the OFDM symbol; or when a value of
energy on the indication RE is less than a preset threshold, the
URLLC control information does not exist in the OFDM symbol.
16. The receiving device according to claim 13, wherein the
receiving device further comprises: a second receiving unit,
configured to receive, from a sending device, a message indicating
a subcarrier on which the indication RE is located.
17. The receiving device according to claim 13, wherein the OFDM
symbol comprises a search space specific to the receiving device,
and when the indication RE indicates that the URLLC control
information exists in the OFDM symbol, the URLLC control
information is in the search space.
18. A receiving device, wherein the receiving device is configured
to receive ultra-reliable and low latency communication (URLLC)
data from time-frequency resources, the time-frequency resources
comprise a plurality of orthogonal frequency division multiplexing
(OFDM) symbols, only some of the plurality of OFDM symbols comprise
a search space specific to the receiving device, the some OFDM
symbols comprise a first OFDM symbol, the search space in the first
OFDM symbol comprises URLLC control information, the receiving
device comprising: a detection unit, configured to detect the URLLC
control information in the search space in the first OFDM symbol;
and a receiving unit, configured to receive the URLLC data based on
the URLLC control information.
19. The receiving device according to claim 18, wherein the some
OFDM symbols comprise an OFDM symbol whose index is an odd number,
an OFDM symbol whose index is an even number, or an OFDM symbol
whose index is a multiple of 3 in the plurality of OFDM
symbols.
20. The receiving device according to claim 18, wherein an OFDM
symbol in the plurality of OFDM symbols other than the some OFDM
symbols comprises a second OFDM symbol, an index of the second OFDM
symbol is N, an index of the first OFDM symbol is N+1, N is a
positive integer, and the second OFDM symbol comprises the URLLC
data.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of International
Application No. PCT/CN2017/117534, filed on Dec. 20, 2017, which
claims priority to Chinese Patent Application No. 201710022855.8,
filed on Jan. 12, 2017. The disclosures of the aforementioned
applications are hereby incorporated by reference in their
entireties.
TECHNICAL FIELD
[0002] Embodiments of the present invention relate to the field of
communications technologies, and in particular, to a data receiving
method, a data sending method, a receiving device, and a sending
device.
BACKGROUND
[0003] A fifth generation (5G) mobile communications system
includes three application scenarios: enhanced mobile broadband
(eMBB), ultra-reliable and low latency communication (URLLC), and
massive machine type communication (mMTC). Time-frequency resource
multiplexing can be implemented for eMBB and URLLC by using a
pre-emption technology, to transmit data by using a time-frequency
resource more efficiently. Generally, the pre-emption technology
means that when URLLC data needs to be sent but all time-frequency
resources currently have been allocated, the URLLC data may occupy
a time-frequency resource that has been allocated to eMBB data, and
the eMBB data is no longer sent on the occupied time-frequency
resource. In addition, to meet a low latency requirement to
transmit the URLLC data anytime as needed, the URLLC data and
control information of the URLLC data may be transmitted by
occupying anytime the time-frequency resource that has been
allocated to the eMBB data.
[0004] FIG. 1 is a schematic diagram of implementing time-frequency
resource multiplexing for eMBB and URLLC by using the pre-emption
technology. As shown in FIG. 1, time-frequency resources allocated
to eMBB data include a control region and a data region. The
control region is used to send eMBB control information. The data
region is used to send the eMBB data, and URLLC data and control
information of the URLLC data that are mapped to the data region by
using the pre-emption technology. Both the URLLC data and the
control information of the URLLC data that are mapped to the data
region by using the pre-emption technology are located in the data
region of the time-frequency resources, and occupy some
time-frequency resources that should have been used to transmit the
eMBB data. Sending of the eMBB data whose time-frequency resources
are occupied is delayed.
[0005] In an existing LTE system, when downlink data is received,
first, blind detection for control information needs to be
performed in a control region, and then the data is received by
using the control information. However, because both the URLLC data
and the control information of the URLLC data are located in the
data region of the time-frequency resources, such a downlink data
receiving method in the existing LTE system cannot be used to
receive the URLLC data.
SUMMARY
[0006] Embodiments of the present invention provide a data
receiving method, a data sending method, a receiving device, and a
sending device, to fast and accurately detect URLLC control
information from time-frequency resources, and further efficiently
receive URLLC data.
[0007] A first aspect of the embodiments of the present invention
provides a method for receiving URLLC data from time-frequency
resources. The method is applied to a receiving device, the
time-frequency resources include eMBB data and the URLLC data, the
time-frequency resources further include an OFDM symbol, the OFDM
symbol includes an indication resource element RE, the indication
RE indicates whether URLLC control information exists in the OFDM
symbol, and the method includes:
[0008] when the indication RE indicates that the URLLC control
information exists in the OFDM symbol, detecting the URLLC control
information in the OFDM symbol; and receiving the URLLC data based
on the detected URLLC control information.
[0009] The URLLC control information may include a transmission
parameter of the URLLC data, for example but not limited to, a
time-frequency resource occupied by the URLLC data and a modulation
and coding scheme used for the URLLC data, so that the receiving
device may demodulate and decode the URLLC data based on the
modulation and coding scheme.
[0010] In the method for receiving URLLC data provided in the
embodiments of the present invention, only one RE in one symbol is
used to indicate whether the URLLC control information exists in
the current symbol, so that resource overheads are reduced. In
addition, when determining, by using the indication RE, that the
URLLC control information exists in the current symbol, the
receiving device can fast detect the URLLC control information from
a preset search space, reducing a URLLC data receiving latency.
[0011] With reference to the first aspect, in an implementation,
that the indication RE indicates whether URLLC control information
exists in the OFDM symbol includes:
[0012] when the indication RE includes a first data symbol, the
URLLC control information exists in the OFDM symbol; or when the
indication RE includes a second data symbol, the URLLC control
information does not exist in the OFDM symbol.
[0013] The first data symbol and the second data symbol are
obtained after performing lower-order modulation or higher-order
modulation on data on the indication RE. Further, the lower-order
modulation includes BPSK, the first data symbol is 1, and the
second data symbol is 0; or the higher-order modulation includes
16QAM or 64QAM, and the first data symbol is any data symbol other
than the second data symbol.
[0014] With reference to the first aspect, in another
implementation, that the indication RE indicates whether URLLC
control information exists in the OFDM symbol includes:
[0015] when a value of energy on the indication RE is greater than
or equal to a preset threshold, the URLLC control information
exists in the OFDM symbol; or when a value of energy on the
indication RE is less than a preset threshold, the URLLC control
information does not exist in the OFDM symbol.
[0016] System bandwidth of a communications system to which the
receiving device currently belongs is divided into a plurality of
subbands, and the indication RE is on one of the plurality of
subbands. This can reduce impact caused on the value of the energy
on the indication RE by an interfering signal from a neighboring
cell of a cell in which the receiving device is located.
[0017] With reference to the first aspect and all implementations
thereof, in another implementation, before the detecting the URLLC
control information in the OFDM symbol, the method further
includes:
[0018] receiving, from a sending device, a message indicating a
subcarrier on which the indication RE is located.
[0019] With reference to the first aspect and all implementations
thereof, in another implementation, the OFDM symbol includes a
search space specific to the receiving device, and when the
indication RE indicates that the URLLC control information exists
in the OFDM symbol, the URLLC control information is in the search
space.
[0020] Further, the detecting the URLLC control information in the
OFDM symbol includes:
[0021] detecting the URLLC control information in the search space
in the OFDM symbol.
[0022] With reference to the first aspect and all implementations
thereof, in another implementation, the time-frequency resources
include a plurality of OFDM symbols, the OFDM symbol is one of the
plurality of OFDM symbols, each of the plurality of OFDM symbols
includes one indication RE, the plurality of OFDM symbols include a
plurality of indication REs, and each of the plurality of
indication REs indicates whether URLLC control information exists
in an OFDM symbol in which the indication RE is located. Further,
the plurality of indication REs are all on a same subcarrier. Each
of the plurality of OFDM symbols includes a search space specific
to the receiving device.
[0023] A second aspect of the embodiments of the present invention
provides a method for receiving URLLC data from time-frequency
resources. The method is applied to a receiving device, the
time-frequency resources include a plurality of OFDM symbols, only
some of the plurality of OFDM symbols include a search space
specific to the receiving device, the some OFDM symbols include a
first OFDM symbol, the search space in the first OFDM symbol
includes URLLC control information, and the method includes:
[0024] detecting the URLLC control information in the search space
in the first OFDM symbol; and
[0025] receiving the URLLC data based on the URLLC control
information.
[0026] The URLLC control information may include a transmission
parameter of the URLLC data, for example but not limited to, a
time-frequency resource occupied by the URLLC data and a modulation
and coding scheme used for the URLLC data, so that the receiving
device may demodulate and decode the URLLC data based on the
modulation and coding scheme.
[0027] In the method for receiving URLLC data provided in the
embodiments of the present invention, no time-frequency resource is
occupied to indicate whether the URLLC control information exists
in the current symbol, so that resource overheads are further
reduced. In addition, the receiving device can fast detect the
URLLC control information from the search space according to a
preset rule, reducing a URLLC data receiving latency.
[0028] Further, the some OFDM symbols include an OFDM symbol whose
index is an odd number, an OFDM symbol whose index is an even
number, or an OFDM symbol whose index is a multiple of 3 in the
plurality of OFDM symbols.
[0029] With reference to the second aspect, in an implementation,
an OFDM symbol in the plurality of OFDM symbols other than the some
OFDM symbols includes a second OFDM symbol, an index of the second
OFDM symbol is N, an index of the first OFDM symbol is N+1, N is a
positive integer, and the second OFDM symbol includes the URLLC
data.
[0030] A third aspect of the embodiments of the present invention
provides a method for sending URLLC data. The method is applied to
a sending device, and includes:
[0031] allocating time-frequency resources to eMBB data;
[0032] indicating, by using an indication resource element RE,
whether URLLC control information exists in an OFDM symbol in the
time-frequency resources, where the indication RE is an RE in the
OFDM symbol, and the URLLC control information includes a
transmission parameter of the URLLC data; and
[0033] sending the eMBB data and the URLLC data in the
time-frequency resources.
[0034] With reference to the third aspect, in an implementation,
the indicating, by using an indication RE, whether URLLC control
information exists in an OFDM symbol in the time-frequency
resources includes:
[0035] indicating, by sending a first data symbol on the indication
RE, that the URLLC control information exists in the OFDM symbol;
or indicating, by sending a second data symbol on the indication
RE, that the URLLC control information does not exist in the OFDM
symbol.
[0036] The first data symbol and the second data symbol are
obtained after performing lower-order modulation or higher-order
modulation on data on the indication RE. Further, the lower-order
modulation includes BPSK, the first data symbol is 1, and the
second data symbol is 0; or the higher-order modulation includes
16QAM or 64QAM, and the first data symbol is any data symbol other
than the second data symbol.
[0037] With reference to the third aspect, in another
implementation, the indicating, by using an indication RE, whether
URLLC control information exists in an OFDM symbol in the
time-frequency resources includes:
[0038] indicating, by sending a data symbol having highest energy
on the indication RE, that the URLLC control information exists in
the OFDM symbol; or indicating, by sending no data symbol on the
indication RE, that the URLLC control information does not exist in
the OFDM symbol.
[0039] System bandwidth of a communications system to which the
sending device currently belongs is divided into a plurality of
subbands, and the indication RE is on one of the plurality of
subbands.
[0040] With reference to the third aspect and all implementations
thereof, in another implementation, before the sending the eMBB
data and the URLLC data in the time-frequency resources, the method
further includes:
[0041] sending, to a receiving device, a message indicating a
subcarrier on which the indication RE is located.
[0042] With reference to the third aspect and all implementations
thereof, in another implementation, the OFDM symbol includes a
search space specific to a receiving device, and when the URLLC
control information exists in the OFDM symbol, the URLLC control
information is in the search space.
[0043] With reference to the third aspect and all implementations
thereof, in another implementation, the time-frequency resources
include a plurality of OFDM symbols, the OFDM symbol is one of the
plurality of OFDM symbols, each of the plurality of OFDM symbols
includes one indication RE, the plurality of OFDM symbols include a
plurality of indication REs, and the sending device indicates, by
using each of the plurality of indication REs, whether URLLC
control information exists in an OFDM symbol in which the
indication RE is located. Further, the plurality of indication REs
are all on a same subcarrier. Each of the plurality of OFDM symbols
includes a search space specific to the receiving device.
[0044] A fourth aspect of the embodiments of the present invention
provides a method for sending URLLC data. The method is applied to
a sending device, and includes:
[0045] allocating time-frequency resources to eMBB data; and
[0046] sending the eMBB data and the URLLC data by using the
time-frequency resources, where the time-frequency resources
include a plurality of OFDM symbols, only some of the plurality of
OFDM symbols include a search space specific to a receiving device,
the some OFDM symbols include a first OFDM symbol, the search space
in the first OFDM symbol includes URLLC control information, and
the URLLC control information includes a transmission parameter of
the URLLC data.
[0047] Further, the some OFDM symbols include an OFDM symbol whose
index is an odd number, an OFDM symbol whose index is an even
number, or an OFDM symbol whose index is a multiple of 3 in the
plurality of OFDM symbols.
[0048] With reference to the fourth aspect, in an implementation,
an OFDM symbol in the plurality of OFDM symbols other than the some
OFDM symbols includes a second OFDM symbol, an index of the second
OFDM symbol is N, an index of the first OFDM symbol is N+1, N is a
positive integer, and the second OFDM symbol includes the URLLC
data.
[0049] A fifth aspect of the embodiments of the present invention
provides a receiving device. The receiving device is configured to
receive URLLC data from time-frequency resources, the
time-frequency resources include eMBB data and the URLLC data, the
time-frequency resources further include an OFDM symbol, the OFDM
symbol includes an indication resource element RE, the indication
RE indicates whether URLLC control information exists in the OFDM
symbol, and the receiving device includes:
[0050] a detection unit, configured to: when the indication RE
indicates that the URLLC control information exists in the OFDM
symbol, detect the URLLC control information in the OFDM symbol;
and
[0051] a first receiving unit, configured to receive the URLLC data
based on the detected URLLC control information.
[0052] With reference to the fifth aspect, in an implementation,
that the indication RE indicates whether URLLC control information
exists in the OFDM symbol includes:
[0053] when the indication RE includes a first data symbol, the
URLLC control information exists in the OFDM symbol; or when the
indication RE includes a second data symbol, the URLLC control
information does not exist in the OFDM symbol.
[0054] The first data symbol and the second data symbol are
obtained after performing lower-order modulation or higher-order
modulation on data on the indication RE. Further, the lower-order
modulation includes BPSK, the first data symbol is 1, and the
second data symbol is 0; or the higher-order modulation includes
16QAM or 64QAM, and the first data symbol is any data symbol other
than the second data symbol.
[0055] With reference to the fifth aspect, in another
implementation, that the indication RE indicates whether URLLC
control information exists in the OFDM symbol includes:
[0056] when a value of energy on the indication RE is greater than
or equal to a preset threshold, the URLLC control information
exists in the OFDM symbol; or when a value of energy on the
indication RE is less than a preset threshold, the URLLC control
information does not exist in the OFDM symbol.
[0057] System bandwidth of a communications system to which the
receiving device currently belongs is divided into a plurality of
subbands, and the indication RE is on one of the plurality of
subbands.
[0058] With reference to the fifth aspect and all implementations
thereof, in another implementation, the receiving device further
includes:
[0059] a second receiving unit, configured to receive, from a
sending device, a message indicating a subcarrier on which the
indication RE is located.
[0060] With reference to the fifth aspect and all implementations
thereof, in another implementation, the OFDM symbol includes a
search space specific to the receiving device, and when the
indication RE indicates that the URLLC control information exists
in the OFDM symbol, the URLLC control information is in the search
space.
[0061] The detection unit is further configured to detect the URLLC
control information in the search space in the OFDM symbol.
[0062] With reference to the fifth aspect and all implementations
thereof, in another implementation, the time-frequency resources
include a plurality of OFDM symbols, the OFDM symbol is one of the
plurality of OFDM symbols, each of the plurality of OFDM symbols
includes one indication RE, the plurality of OFDM symbols include a
plurality of indication REs, and each of the plurality of
indication REs indicates whether URLLC control information exists
in an OFDM symbol in which the indication RE is located. Further,
the plurality of indication REs are all on a same subcarrier. Each
of the plurality of OFDM symbols includes a search space specific
to the receiving device.
[0063] A sixth aspect of the embodiments of the present invention
provides a receiving device. The receiving device is configured to
receive URLLC data from time-frequency resources, the
time-frequency resources include a plurality of OFDM symbols, only
some of the plurality of OFDM symbols include a search space
specific to the receiving device, the some OFDM symbols include a
first OFDM symbol, the search space in the first OFDM symbol
includes URLLC control information, and the receiving device
includes:
[0064] a detection unit, configured to detect the URLLC control
information in the search space in the first OFDM symbol; and
[0065] a receiving unit, configured to receive the URLLC data based
on the URLLC control information.
[0066] Further, the some OFDM symbols include an OFDM symbol whose
index is an odd number, an OFDM symbol whose index is an even
number, or an OFDM symbol whose index is a multiple of 3 in the
plurality of OFDM symbols.
[0067] With reference to the sixth aspect, in an implementation, an
OFDM symbol in the plurality of OFDM symbols other than the some
OFDM symbols includes a second OFDM symbol, an index of the second
OFDM symbol is N, an index of the first OFDM symbol is N+1, N is a
positive integer, and the second OFDM symbol includes the URLLC
data.
[0068] A seventh aspect of the embodiments of the present invention
provides a sending device, including:
[0069] an allocation unit, configured to allocate time-frequency
resources to eMBB data;
[0070] an indication unit, configured to indicate, by using an
indication resource element RE, whether URLLC control information
exists in an OFDM symbol in the time-frequency resources, where the
indication RE is an RE in the OFDM symbol, and the URLLC control
information includes a transmission parameter of URLLC data;
and
[0071] a first sending unit, configured to send the eMBB data and
the URLLC data in the time-frequency resources.
[0072] With reference to the seventh aspect, in an implementation,
the indication unit is further configured to:
[0073] indicate, by sending a first data symbol on the indication
RE, that the URLLC control information exists in the OFDM symbol;
or indicate, by sending a second data symbol on the indication RE,
that the URLLC control information does not exist in the OFDM
symbol.
[0074] The first data symbol and the second data symbol are
obtained after performing lower-order modulation or higher-order
modulation on data on the indication RE. Further, the lower-order
modulation includes BPSK, the first data symbol is 1, and the
second data symbol is 0; or the higher-order modulation includes
16QAM or 64QAM, and the first data symbol is any data symbol other
than the second data symbol.
[0075] With reference to the seventh aspect, in another
implementation, the indication unit is further configured to:
[0076] indicate, by sending a data symbol having highest energy on
the indication RE, that the URLLC control information exists in the
OFDM symbol; or indicate, by sending no data symbol on the
indication RE, that the URLLC control information does not exist in
the OFDM symbol.
[0077] System bandwidth of a communications system to which the
sending device currently belongs is divided into a plurality of
subbands, and the indication RE is on one of the plurality of
subbands.
[0078] With reference to the seventh aspect and all implementations
thereof, in another implementation, the sending device further
includes:
[0079] a second sending unit, configured to send, to a receiving
device, a message indicating a subcarrier on which the indication
RE is located.
[0080] With reference to the seventh aspect and all implementations
thereof, in another implementation, the OFDM symbol includes a
search space specific to a receiving device, and when the URLLC
control information exists in the OFDM symbol, the URLLC control
information is in the search space.
[0081] With reference to the seventh aspect and all implementations
thereof, in another implementation, the time-frequency resources
include a plurality of OFDM symbols, the OFDM symbol is one of the
plurality of OFDM symbols, each of the plurality of OFDM symbols
includes one indication RE, the plurality of OFDM symbols include a
plurality of indication REs, and the sending device indicates, by
using each of the plurality of indication REs, whether URLLC
control information exists in an OFDM symbol in which the
indication RE is located. Further, the plurality of indication REs
are all on a same subcarrier. Each of the plurality of OFDM symbols
includes a search space specific to the receiving device.
[0082] An eighth aspect of the embodiments of the present invention
provides a sending device, including:
[0083] an allocation unit, configured to allocate time-frequency
resources to eMBB data; and
[0084] a sending unit, configured to send the eMBB data and URLLC
data by using the time-frequency resources, where the
time-frequency resources include a plurality of OFDM symbols, only
some of the plurality of OFDM symbols include a search space
specific to a receiving device, the some OFDM symbols include a
first OFDM symbol, the search space in the first OFDM symbol
includes URLLC control information, and the URLLC control
information includes a transmission parameter of the URLLC
data.
[0085] Further, the some OFDM symbols include an OFDM symbol whose
index is an odd number, an OFDM symbol whose index is an even
number, or an OFDM symbol whose index is a multiple of 3 in the
plurality of OFDM symbols.
[0086] With reference to the eighth aspect, in an implementation,
an OFDM symbol in the plurality of OFDM symbols other than the some
OFDM symbols includes a second OFDM symbol, an index of the second
OFDM symbol is N, an index of the first OFDM symbol is N+1, N is a
positive integer, and the second OFDM symbol includes the URLLC
data.
[0087] A ninth aspect of the present invention provides an
information transmission apparatus. The apparatus includes: a
memory, a processor, and a transceiver. The memory stores a
computer instruction. The processor implements the method in the
first aspect by executing the computer instruction.
[0088] A tenth aspect of the present invention provides an
information transmission apparatus. The apparatus includes: a
memory, a processor, and a transceiver. The memory stores a
computer instruction. The processor implements the method in the
second aspect by executing the computer instruction.
[0089] An eleventh aspect of the present invention provides an
information transmission apparatus. The apparatus includes: a
memory, a processor, and a transceiver. The memory stores a
computer instruction. The processor implements the method in the
third aspect by executing the computer instruction.
[0090] A twelfth aspect of the present invention provides an
information transmission apparatus. The apparatus includes: a
memory, a processor, and a transceiver. The memory stores a
computer instruction. The processor implements the method in the
fourth aspect by executing the computer instruction.
[0091] A thirteenth aspect of the present invention provides a
storage medium. The storage medium stores program code. When the
program code is executed, the method in the first aspect is
performed. The storage medium includes but is not limited to a
flash memory (flash memory), a hard disk drive (HDD), or a solid
state drive (SSD).
[0092] A fourteenth aspect of the present invention provides a
storage medium. The storage medium stores program code. When the
program code is executed, the method in the second aspect is
performed. The storage medium includes but is not limited to a
flash memory, a hard disk drive, or a solid state drive.
[0093] A fifteenth aspect of the present invention provides a
storage medium. The storage medium stores program code. When the
program code is executed, the method in the third aspect is
performed. The storage medium includes but is not limited to a
flash memory, a hard disk drive, or a solid state drive.
[0094] A sixteenth aspect of the present invention provides a
storage medium. The storage medium stores program code. When the
program code is executed, the method in the fourth aspect is
performed. The storage medium includes but is not limited to a
flash memory, a hard disk drive, or a solid state drive.
[0095] In the method for receiving URLLC data provided in the
embodiments of the present invention, only one RE in one symbol is
used to indicate whether the URLLC control information exists in
the current symbol, so that resource overheads are reduced. In
addition, when determining, by using the indication RE, that the
URLLC control information exists in the current symbol, the
receiving device can fast detect the URLLC control information from
a preset search space, reducing a URLLC data receiving latency.
DESCRIPTION OF DRAWINGS
[0096] To describe technical solutions in embodiments of the
present invention more clearly, the following briefly describes
accompanying drawings required for describing the embodiments of
the present invention.
[0097] FIG. 1 is a schematic diagram of implementing time-frequency
resource multiplexing for eMBB and URLLC by using a pre-emption
technology;
[0098] FIG. 2 is a schematic diagram of a system architecture to
which an embodiment of the present invention is applicable;
[0099] FIG. 3 is a schematic diagram of a method for receiving
URLLC data;
[0100] FIG. 4 is a schematic flowchart of a method for sending and
receiving URLLC data according to an embodiment of the present
invention;
[0101] FIG. 5 is a schematic diagram of indication based on
lower-order modulation according to an embodiment of the present
invention;
[0102] FIG. 6 is a schematic diagram of indication based on
higher-order modulation according to an embodiment of the present
invention;
[0103] FIG. 7 is a schematic diagram of system bandwidth division
according to an embodiment of the present invention;
[0104] FIG. 8 is a schematic diagram of a search space according to
an embodiment of the present invention;
[0105] FIG. 9 is a schematic flowchart of another method for
sending and receiving URLLC data according to an embodiment of the
present invention;
[0106] FIG. 10 is a schematic structural diagram of a receiving
device according to an embodiment of the present invention;
[0107] FIG. 11 is a schematic structural diagram of another
receiving device according to an embodiment of the present
invention;
[0108] FIG. 12 is a schematic structural diagram of a sending
device according to an embodiment of the present invention;
[0109] FIG. 13 is a schematic structural diagram of another sending
device according to an embodiment of the present invention; and
[0110] FIG. 14 is a physical structural diagram of an information
transmission device according to an embodiment of the present
invention.
DESCRIPTION OF EMBODIMENTS
[0111] To make objectives, technical solutions, and advantages of
the present invention clearer, the following further describes the
present invention in detail with reference to accompanying
drawings. Apparently, the described embodiments are only some
rather than all of the embodiments of the present invention.
[0112] In the specification, claims, and accompanying drawings of
this application, terms "first", "second", and the like are
intended to distinguish between different objects but do not
indicate a particular order. In addition, terms "including",
"comprising", or any other variant thereof are intended to cover a
non-exclusive inclusion. For example, a process, a method, a
system, a product, or a device that includes a series of operations
or units is not limited to listed operations or units, but In one
embodiment further includes an unlisted operation or unit, or In
one embodiment further includes another inherent operation or unit
of the process, the method, the product, or the device.
[0113] An information transmission method in the embodiments of the
present invention is applicable to a plurality of system
architectures. FIG. 2 is a schematic diagram of a system
architecture to which an embodiment of the present invention is
applicable. As shown in FIG. 2, the system architecture 20 includes
a sending device 201 and a receiving device 202. The sending device
201 may transmit information to the receiving device 202 through a
network.
[0114] In this embodiment of the present invention, the sending
device may be a base station (BS) device. The base station device
may also be referred to as a base station, which is an apparatus
that is deployed in a radio access network to provide a wireless
communication function. For example, in a 2G network, a device
providing a base station function includes a base transceiver
station (BTS) and a base station controller (BSC). In a 3G network,
a device providing a base station function includes a NodeB (NodeB)
and a radio network controller (RNC). In a 4G network, a device
providing a base station function includes an evolved NodeB (eNB).
In a 5G network, a device providing a base station function
includes a new radio NodeB (gNB), a centralized unit (CU), a
distributed unit (Distributed Unit), and a new radio controller. In
a WLAN, a device providing a base station function is an access
point (AP).
[0115] The receiving device may be a device providing voice and/or
data connectivity for a user, including a wired terminal and a
wireless terminal. The wireless terminal may be a handheld device
having a wireless connection function, or another processing device
connected to a wireless modem, or a mobile terminal that
communicates with one or more core networks through a radio access
network. For example, the wireless terminal may be a mobile phone,
a computer, a tablet computer, a personal digital assistant (PDA),
a mobile Internet device (MID), a wearable device, or an e-book
reader (e-book reader). For another example, the wireless terminal
may be a portable, pocket-sized, handheld, computer built-in, or
in-vehicle mobile device. For still another example, the wireless
terminal may be a part of a mobile station (mobile station), an
access point (access point), or user equipment (UE).
[0116] Communications systems to which the foregoing system
architecture is applicable include but are not limited to Code
Division Multiple Access (CDMA) IS-95, Code Division Multiple
Access (CDMA) 2000, Time Division-Synchronous Code Division
Multiple Access (TD-SCDMA), Wideband Code Division Multiple Access
(WCDMA), Time Division Duplex-Long Term Evolution (TDD LTE),
Frequency Division Duplex-Long Term Evolution (FDD LTE), Long Term
Evolution-Advanced (LTE-advanced), and various future evolved
wireless communications systems (for example, a 5G system).
[0117] Receiving of URLLC data depends on control information of
the URLLC data. When time-frequency resource multiplexing is
implemented for eMBB and URLLC by using a pre-emption technology,
provided that the control information of the URLLC data is detected
from time-frequency resources carrying eMBB data, a receiving
device can receive the URLLC data by using the control information.
FIG. 3 is a schematic diagram of a method for receiving URLLC data.
As shown in the figure, in the method, a control channel is added
at an end of an eMBB scheduling period, to indicate information
about URLLC data in the eMBB scheduling period. The information
includes: a quantity of pieces of the URLLC data in the scheduling
period and time-frequency locations of each piece of URLLC data and
control information of each piece of URLLC data. In this way, all
the URLLC data can be received. However, because the control
information is located at the end of the eMBB scheduling period, a
receiving device cannot receive the URLLC data until the eMBB
scheduling period ends. Consequently, a relatively long URLLC data
receiving latency is caused, and a low latency requirement of URLLC
cannot be met.
[0118] FIG. 4 is a schematic flowchart of a method for sending and
receiving URLLC data according to an embodiment of the present
invention. The method mainly includes two parts. A first part is
URLLC control information indication, and a second part is URLLC
control information detection based on the URLLC control
information indication. The URLLC control information indication is
performed to indicate whether URLLC control information exists in
an OFDM symbol (a symbol for short below). Based on the indication,
a receiving device performs the URLLC control information detection
only in a symbol in which URLLC control information exists, to fast
and accurately detect URLLC control information from time-frequency
resources at relatively low time-frequency resource overheads and
calculation complexity, and further receive the URLLC data. As
shown in FIG. 4, the method for sending and receiving URLLC data
includes the following operations (unless otherwise stated, there
is no particular timing relationship between the following
operations).
[0119] Operation S401: A sending device allocates time-frequency
resources (time-frequency resources for short below) to eMBB
data.
[0120] This embodiment of the present invention is described by
using time-frequency resources of one transmission time interval
(English: Transmission Time Interval, TTI for short, which may also
be referred to as a scheduling period or a transmission period) as
an example.
[0121] Operation S402: The sending device obtains URLLC data.
[0122] The sending device may receive the URLLC data from a core
network element, a gateway, a business server, or the like. This is
not limited in this embodiment of the present invention.
[0123] Operation S403: The sending device maps the URLLC data and
control information of the URLLC data to the time-frequency
resources that are allocated to the eMBB data in S401.
[0124] Operation S404: The sending device indicates symbols in
which the URLLC control information exists in the time-frequency
resources.
[0125] This embodiment of the present invention provides three
URLLC control information indication methods: 1. an indication
method based on lower-order modulation; 2. an indication method
based on higher-order modulation; and 3. an energy indication
method. In all of the three methods, URLLC control information
indication is implemented by using an indication resource element
(English: Resource Element, RE for short). Each symbol of the
time-frequency resources has one indication RE, to indicate whether
URLLC control information exists in the current symbol (namely, the
symbol in which the indication RE is located, the same below).
Indication REs in different symbols may be located on a same
subcarrier, or may be located on different subcarriers. When URLLC
control information sent to a receiving device spans a plurality of
symbols, that the URLLC control information exists may be indicated
only on an indication RE in a first symbol of the plurality of
symbols, to indicate that the URLLC control information starts from
the current symbol.
[0126] 1. Indication Method Based on Lower-Order Modulation
[0127] FIG. 5 is a schematic diagram of indication based on
lower-order modulation according to an embodiment of the present
invention. As shown in FIG. 5, the indication based on lower-order
modulation means that the sending device modulates, by using a
lower-order modulation technology, for example, binary phase shift
keying (English: Binary Phase Shift Keying, BPSK for short), data
to be sent on an indication RE. In one embodiment, after the
sending device modulates, by using the lower-order modulation
technology, the data to be sent on the indication RE, when a data
symbol "1" is sent on the indication RE, it indicates that URLLC
control information exists in a current symbol; when a data symbol
"0" is sent, it indicates that URLLC control information does not
exist in a current symbol. When receiving the data symbol "1" on
the indication RE, the receiving device may determine that the
URLLC control information exists in the current symbol; when
receiving the data symbol "0", the receiving device may determine
that the URLLC control information does not exist in the current
symbol. When the URLLC control information spans a plurality of
symbols, the sending device may send the data symbol "1" only on an
indication RE in a first symbol of the plurality of symbols spanned
by the URLLC control information, and send the data symbol "0" on
an indication RE in another symbol, or may send the data symbol "1"
on an indication RE in each of the plurality of symbols spanned by
the URLLC control information. A person skilled in the art should
understand that, alternatively, the sending device may send the
data symbol "1" on the indication RE to indicate that the URLLC
control information does not exist in the current symbol, and send
the data symbol "0" to indicate that the URLLC control information
exists in the current symbol.
[0128] 2. Indication Method Based on Higher-Order Modulation
[0129] FIG. 6 is a schematic diagram of indication based on
higher-order modulation according to an embodiment of the present
invention. The indication based on higher-order modulation means
that the sending device modulates, by using a higher-order
modulation technology, for example, 16-quadrature amplitude
modulation (16QAM) or 64-quadrature amplitude modulation (64QAM),
data to be sent on an indication RE. The higher-order modulation is
less reliable than the lower-order modulation, and an error easily
occurs during data transmission, and causes the receiving device to
erroneously determine whether URLLC control information exists in a
current symbol, including: determining a fact that the URLLC
control information does not exist as that the URLLC control
information exists, or determining a fact that the URLLC control
information exists as that the URLLC control information does not
exist. The former erroneous determining causes the receiving device
to perform unnecessary detection once. The latter erroneous
determining causes the receiving device to miss the URLLC control
information. Apparently, the latter erroneous determining costs
much more than the former one. To avoid the latter erroneous
determining as far as possible, as shown in FIG. 6, after the
sending device modulates, by using the higher-order modulation
technology, the data to be sent on the indication RE, when a
particular data symbol (for example, "0000") is sent on the
indication RE, it indicates that the URLLC control information does
not exist in the current symbol; when any data symbol (for example,
"1111") other than the particular data symbol is sent on the
indication RE, it indicates that the URLLC control information
exists in the current symbol. When receiving the data symbol "0000"
on the indication RE, the receiving device may determine that the
URLLC control information does not exist in the current symbol;
when receiving any data symbol other than "0000", the receiving
device may determine that the URLLC control information exists in
the current symbol. It can be learned from FIG. 6 that, when the
sending device sends the data symbol "1111" on the indication RE to
indicate that the URLLC control information exists in the current
symbol, even though an error occurs and causes the receiving device
to erroneously determine the data symbol "1111" as another data
symbol (for example, "1110") during demodulation, it may be
correctly determined that the URLL control information exists in
the current symbol, provided that the data symbol "1111" is not
erroneously determined as "0000".
[0130] 3. Energy Indication Method
[0131] In the energy indication method, indication is performed by
using energy on an indication RE. In one embodiment, when URLLC
control information does not exist in a current symbol, the sending
device does not send any data symbol on the indication RE, in other
words, the energy on the indication RE is 0; when URLLC control
information exists in a current symbol, the sending device sends,
on the indication RE, a data symbol that has highest energy when a
current modulation technology is used, for example, a data symbol
corresponding to a constellation point 601 in FIG. 6. The receiving
device measures a value of the energy on the indication RE. If the
value of the energy on the indication RE is less than a preset
threshold, it is determined that the URLLC control information does
not exist in the current symbol. If the value of the energy on the
indication RE is greater than or equal to the preset threshold, it
is determined that the URLLC control information exists in the
current symbol. The preset threshold is greater than 0. The preset
threshold is not 0 for a reason that even though the sending device
does not send any signal on the indication RE, the value of the
energy on the indication RE is probably greater than 0 because of
noise and interference from another cell.
[0132] FIG. 7 is a schematic diagram of system bandwidth division
according to an embodiment of the present invention. When the
energy indication method is used, cell (for example, cell 70) users
are classified into a cell center (for example, a cell center 701)
user (a center user for short below) and a cell edge (for example,
a cell edge 702) user (an edge user for short below). If an edge
user in a neighboring cell of a cell in which the sending device is
located receives data on an RE that has a same frequency as the
indication RE, energy on the RE is superposed on the indication RE,
and increases the value of the energy on the indication RE.
Consequently, erroneous determining of the receiving device is
caused. For example, a fact that the URLLC control information does
not exist is determined as that the URLLC control information
exists. To reduce a probability of erroneous determining of the
receiving device, as shown in FIG. 7, entire system bandwidth of a
system to which the sending device and/or the receiving device
belong/belongs may be divided into three subbands: a subband 1, a
subband 2, and a subband 3, an edge user in each of three
neighboring cells uses a frequency of one of the three subbands for
data transmission, and a center user in each of the three
neighboring cells uses the entire system bandwidth. Edge users in
any two neighboring cells use different subbands. In each cell, an
RE on a subband used by an edge user in the current cell is used as
an indication RE. For example, in the cell 70, an RE on the subband
3 is used as an indication RE, and an edge user in the cell 71 uses
an RE on the subband 2 to receive data. In this way, the edge user
in the cell 71 receives the data on the RE that has a frequency
different from that of the indication RE used in the cell 70, so
that the probability of erroneous determining of the receiving
device is reduced when the energy indication method is used.
[0133] In one embodiment, when the foregoing three methods are used
to indicate the URLLC control information, for each cell, the
sending device may add frequency domain location information of the
indication RE to a field of a master information block (MIB) or a
system information block (SIB), and then send the frequency domain
location information of the indication RE to all receiving devices
in the cell by using the MIB or the SIB. In the method shown in
FIG. 4, the sending device may first perform this operation.
[0134] Operation S405: The sending device sends the eMBB data and
the URLLC data in the time-frequency resources.
[0135] Operation S406: A receiving device determines, based on an
indication RE, whether the URLLC control information exists in the
time-frequency resources.
[0136] Refer to the description about how the receiving device
determines whether the URLLC control information exists in the
time-frequency resources in S404. Details are not described herein
again.
[0137] Operation S407: The receiving device detects the URLLC
control information in the symbols in which the URLLC control
information exists.
[0138] In an LTE system, downlink control information (DCI) is sent
by using a physical downlink control channel (PDCCH). The DCI has a
plurality of formats (format), DCI in different formats may have
different sizes, a basic unit for carrying the DCI is a control
channel element (English: Control Channel Element, CCE for short),
and one CCE includes 36 REs. When receiving the DCI, the receiving
device neither knows a format of the DCI sent on the current PDCCH,
nor knows a location of information needed by the receiving device,
but the receiving device knows information currently expected by
the receiving device. For different expected information, the
receiving device performs CRC check by using a corresponding radio
network temporary identifier (RNTI) and CCE order. If the CRC check
succeeds, the receiving device determines that the CCE information
is needed by the receiving device, and may also determine a
corresponding DCI format and modulation scheme, to demodulate and
decode DCI content. This is a process of blind detection for DCI in
the LTE system.
[0139] To improve efficiency of blind detection, a concept of a
search space is introduced into the LTE system. The DCI is limited
to being in the search space, and the receiving device needs to
perform blind detection for the DCI only in the search space. For
DCI in some formats, for example, paging (paging), all receiving
devices need to listen to the DCI. For DCI in some other formats,
for example, an uplink/downlink scheduling instruction, only a
particular receiving device is related, and only the particular
receiving device needs to listen to the DCI. Therefore, in the LTE
system, a common search space (Common Search Space) and a
UE-specific search space (UE-Specific Search Space) are further
obtained through classification, to further improve efficiency of
blind detection of the receiving device.
[0140] The search space in the LTE system is located in a control
region of time-frequency resources, but URLLC control information
is located in a data region of the time-frequency resources.
Therefore, a new search space is defined in this embodiment of the
present invention. For each receiving device in a cell, each symbol
of the receiving device in a data region of time-frequency
resources has an entire or partial search space specific to the
receiving device. The expression "entire or partial search space"
is used because one search space may span a plurality of
consecutive symbols. FIG. 8 is a schematic diagram of a search
space according to an embodiment of the present invention. As shown
in FIG. 8, search spaces 1 to 8 are respectively located in symbols
1 to 8, a search space 9 is located in symbols 9 and 10, and a
search space 10 is located in symbols 10 and 11. All the search
spaces 1 to 10 are search spaces specific to a receiving
device.
[0141] The receiving device may obtain a frequency domain location
of the search space of the receiving device in each symbol in the
data region of the time-frequency resources by using a particular
mapping algorithm (for example but not limited to, referring to a
manner in the LTE system of calculating a frequency domain location
of a search space by using a radio network temporary identifier
(English: Radio Network Temporary Identifier, RNTI for short) of a
receiving device and a current subframe number). When mapping the
obtained URLLC data to the time-frequency resources, the sending
device adds the URLLC control information to the search space
specific to the receiving device. In this way, the receiving device
may first determine symbols in which the URLLC control information
exists, and then perform detection in a specific search space in
the symbols in which the URLLC control information exists, to
increase a URLLC control information detection speed. During
detection, the receiving device may use a method for blind
detection for DCI in the existing LTE system, or may use another
method. This is not limited in this embodiment of the present
invention.
[0142] Operation S408: The receiving device receives the URLLC data
based on the detected URLLC control information.
[0143] The receiving device may learn of a transmission parameter
of the URLLC data from the detected URLLC control information, and
receive the URLLC data based on the transmission parameter.
[0144] Compared with the prior art, in the method for sending and
receiving URLLC data provided in this embodiment of the present
invention, only one RE in one symbol is used to indicate whether
the URLLC control information exists in the current symbol, so that
resource overheads are reduced. In addition, when determining, by
using the indication RE, that the URLLC control information exists
in the current symbol, the receiving device can fast detect the
URLLC control information from a preset search space, reducing a
URLLC data receiving latency.
[0145] FIG. 9 is a schematic flowchart of another method for
sending and receiving URLLC data according to an embodiment of the
present invention. In this method, a sending device does not
indicate symbols in which URLLC control information exists in
time-frequency resources, but according to a preset rule, adds the
URLLC control information to some symbols in the time-frequency
resources for sending. Correspondingly, a receiving device detects
the URLLC control information only in the some symbols. As shown in
FIG. 9, the method for sending and receiving URLLC data includes
the following operations (unless otherwise stated, there is no
particular timing relationship between the following
operations).
[0146] Operation S901: The sending device allocates time-frequency
resources (time-frequency resources for short below) to eMBB
data.
[0147] This embodiment of the present invention is described by
using time-frequency resources of one transmission time interval
(English: Transmission Time Interval, TTI for short, which may also
be referred to as a scheduling period or a transmission period) as
an example.
[0148] Operation S902: The sending device obtains URLLC data.
[0149] The sending device may receive the URLLC data from a core
network element, a gateway, a business server, or the like. This is
not limited in this embodiment of the present invention.
[0150] Operation S903: The sending device maps the URLLC data and
control information of the URLLC data to the time-frequency
resources that are allocated to the eMBB data in S901.
[0151] In this embodiment of the present invention, the sending
device maps the URLLC control information to some symbols in the
time-frequency resources according to a preset rule, for example
but not limited to, mapping the URLLC control information to a
symbol whose index is an odd number (a symbol 1, 3, 5), whose index
is an even number (a symbol 2, 4, 6 . . . ), or whose index is a
multiple of 3 (a symbol 3, 6, 9 . . . ).
[0152] For each cell, the sending device may add time domain
location information (indicating symbols in which the URLLC control
information exists, or a rule according to which the sending device
maps the URLLC control information) of the URLLC control
information to a field of a MIB or a SIB, and then send the time
domain location information of the URLLC control information to all
receiving devices in the cell by using the MIB or the SIB. In the
method shown in FIG. 9, the sending device may first perform this
operation.
[0153] Operation S904: The sending device sends the eMBB data and
the URLLC data in the time-frequency resources.
[0154] Operation S905: The receiving device detects the URLLC
control information in a symbol in which the URLLC control
information exists.
[0155] In this embodiment of the present invention, based on the
design of the search space shown in FIG. 8, a location of the
search space is further limited to being in the symbol in which the
URLLC control information is located. By way of example without
limitation, when the sending device adds the URLLC control
information to the symbol whose index is an odd number, whose index
is an even number, or whose index is a multiple of 3 for sending, a
search space specific to the receiving device is correspondingly
located in the symbol whose index is an odd number, whose index is
an even number, or whose index is a multiple of 3. When a search
space spans a plurality of consecutive symbols, in this embodiment
of the present invention, a start symbol of the search space may be
limited to being the symbol in which the URLLC control information
exists. For example, when the sending device adds the URLLC control
information to the symbol whose index is an odd number for sending,
the start symbol of the search space may be the symbol 1, 3, 5 . .
. , and if the search space spans two consecutive symbols, the
receiving device detects the URLLC control information in the
search space in symbols 1 and 2.
[0156] Operation S906: The receiving device receives the URLLC data
based on the detected URLLC control information.
[0157] The receiving device may learn of a transmission parameter
of the URLLC data (for example but not limited to, a time-frequency
resource occupied by the URLLC data and a modulation and coding
scheme used for the URLLC data, so that the receiving device may
demodulate and decode the URLLC data based on the modulation and
coding scheme) from the detected URLLC control information, and
receive the URLLC data based on the transmission parameter.
[0158] In this embodiment of the present invention, when control
information is added to some symbols according to a preset rule for
sending, for example, when the URLLC control information is sent
only in the symbol whose index is an odd number, a URLLC data
receiving latency may occur. Because of a low latency
characteristic of the URLLC data, the sending device performs,
anytime for the URLLC data, puncturing in the time-frequency
resources carrying the eMBB data. For example, the URLLC data needs
to be sent on a symbol 6, but according to the rule, the URLLC
control information is sent only in the symbol whose index is an
odd number. Therefore, the URLLC data needs to wait to be sent
together with the control information in a symbol 7. A latency of
one symbol is caused. To avoid the latency, in this embodiment of
the present invention, the data may be sent before the control
information of the data. In the foregoing example, the URLLC data
may be directly sent in the symbol 6, and then the control
information of the URLLC data is sent in the symbol 7, to avoid the
URLLC data receiving latency.
[0159] Compared with the prior art, in the method for sending and
receiving URLLC data provided in this embodiment of the present
invention, no time-frequency resource is occupied to indicate
whether the URLLC control information exists in the current symbol,
so that resource overheads are further reduced. In addition, the
receiving device can fast detect the URLLC control information from
a preset search space, reducing a URLLC data receiving latency.
[0160] FIG. 10 is a schematic structural diagram of a receiving
device according to an embodiment of the present invention. The
receiving device 100 is configured to perform the method on the
receiving device side shown in FIG. 4, receiving URLLC data from
time-frequency resources. The time-frequency resources include eMBB
data and the URLLC data, the time-frequency resources further
include an OFDM symbol, the OFDM symbol includes an indication
resource element RE, the indication RE indicates whether URLLC
control information exists in the OFDM symbol, and the receiving
device includes:
[0161] a detection unit 1001, configured to: when the indication RE
indicates that the URLLC control information exists in the OFDM
symbol, detect the URLLC control information in the OFDM symbol;
and
[0162] a first receiving unit 1002, configured to receive the URLLC
data based on the detected URLLC control information.
[0163] In one embodiment, the receiving device further includes a
second receiving unit 1003, configured to receive, from a sending
device, a message indicating a subcarrier on which the indication
RE is located.
[0164] In one embodiment, the detection unit 1001 is further
configured to detect the URLLC control information in a search
space in the OFDM symbol.
[0165] FIG. 11 is a schematic structural diagram of another
receiving device according to an embodiment of the present
invention. The receiving device 110 is configured to perform the
method on the receiving device side shown in FIG. 9, receiving
URLLC data from time-frequency resources. The time-frequency
resources include a plurality of OFDM symbols, only some of the
plurality of OFDM symbols include a search space specific to the
receiving device, the some OFDM symbols include a first OFDM
symbol, the search space in the first OFDM symbol includes URLLC
control information, and the receiving device includes:
[0166] a detection unit 1101, configured to detect the URLLC
control information in the search space in the first OFDM symbol;
and
[0167] a receiving unit 1102, configured to receive the URLLC data
based on the URLLC control information.
[0168] FIG. 12 is a schematic structural diagram of a sending
device according to an embodiment of the present invention. The
sending device 120 is configured to perform the method on the
sending device side shown in FIG. 4, and includes:
[0169] an allocation unit 1201, configured to allocate
time-frequency resources to eMBB data;
[0170] an indication unit 1202, configured to indicate, by using an
indication resource element RE, whether URLLC control information
exists in an OFDM symbol in the time-frequency resources, where the
indication RE is an RE in the OFDM symbol, and the URLLC control
information includes a transmission parameter of URLLC data;
and
[0171] a first sending unit 1203, configured to send the eMBB data
and the URLLC data in the time-frequency resources.
[0172] In one embodiment, the indication unit 1202 is further
configured to: indicate, by sending a first data symbol on the
indication RE, that the URLLC control information exists in the
OFDM symbol; or indicate, by sending a second data symbol on the
indication RE, that the URLLC control information does not exist in
the OFDM symbol.
[0173] In one embodiment, the indication unit 1202 is further
configured to: indicate, by sending a data symbol having highest
energy on the indication RE, that the URLLC control information
exists in the OFDM symbol; or indicate, by sending no data symbol
on the indication RE, that the URLLC control information does not
exist in the OFDM symbol.
[0174] In one embodiment, the sending device 120 further includes a
second sending unit 1204, configured to send, to a receiving
device, a message indicating a subcarrier on which the indication
RE is located.
[0175] FIG. 13 is a schematic structural diagram of another sending
device according to an embodiment of the present invention. The
sending device 130 is configured to perform the method on the
sending device side shown in FIG. 9, and includes:
[0176] an allocation unit 1301, configured to allocate
time-frequency resources to eMBB data; and
[0177] a sending unit 1302, configured to send the eMBB data and
URLLC data by using the time-frequency resources, where the
time-frequency resources include a plurality of OFDM symbols, only
some of the plurality of OFDM symbols include a search space
specific to a receiving device, the some OFDM symbols include a
first OFDM symbol, the search space in the first OFDM symbol
includes URLLC control information, and the URLLC control
information includes a transmission parameter of the URLLC
data.
[0178] FIG. 14 is a physical structural diagram of an information
transmission device according to an embodiment of the present
invention. The device 140 may be configured to perform the method
on the sending device side or the method on the receiving device
side shown in FIG. 4, or the method on the sending device side or
the method on the receiving device side shown in FIG. 9. The device
140 includes: a memory 1401, a processor 1402, a transceiver 1403,
and a bus system 1404.
[0179] The memory 1401 is configured to store a program. In one
embodiment, the program may include program code, and the program
code includes a computer operation instruction. The memory 1401 may
be a random access memory (random access memory, RAM for short), or
may be a non-volatile memory (non-volatile memory), for example, at
least one magnetic disk memory. Only one memory is shown in the
figure. Certainly, a plurality of memories may be provided as
required. Alternatively, the memory 1401 may be a memory in the
processor 1402.
[0180] The memory 1401 stores the following elements: an executable
module or a data structure, a subset thereof, or an extended set
thereof:
[0181] an operation instruction, including various operation
instructions and used to implement various operations; and
[0182] an operating system, including various system programs and
used to implement various basic services and process a
hardware-based task.
[0183] The processor 1402 controls an operation of the device 140,
and the processor 1402 may also be referred to as a CPU (Central
Processing Unit, central processing unit). In a specific
application, components of the device 140 are coupled together by
using the bus system 1404. In addition to a data bus, the bus
system 1404 may further include a power bus, a control bus, a
status signal bus, and the like. However, for clear description,
various types of buses in the figure are marked as the bus system
1404. For ease of illustration, FIG. 14 merely shows an example of
the bus system 1404.
[0184] The methods disclosed in the embodiments of this application
may be applied to the processor 1402, or may be implemented by the
processor 1402. The processor 1402 may be an integrated circuit
chip and has a signal processing capability. In an implementation
process, operations in the foregoing methods can be implemented by
using a hardware integrated logic circuit in the processor 1402, or
by using instructions in a form of software. The processor 1402 may
be a general purpose processor, a digital signal processor (DSP),
an application-specific integrated circuit (ASIC), a field
programmable gate array (FPGA) or another programmable logic
device, a discrete gate or a transistor logic device, or a discrete
hardware component. The processor 1402 may implement or perform the
methods, the operations, and logical block diagrams disclosed in
the embodiments of this application. The general purpose processor
may be a microprocessor, or the processor may be any conventional
processor or the like. Operations of the methods disclosed with
reference to the embodiments of this application may be directly
executed and accomplished by a hardware decoding processor, or may
be executed and accomplished by using a combination of hardware in
the decoding processor and a software module. The software module
may be located in a mature storage medium in the art, such as a
random access memory, a flash memory, a read-only memory, a
programmable read-only memory, an electrically erasable
programmable memory, a register, or the like. The storage medium is
located in the memory 1401. The processor 1402 reads information in
the memory 1401, and performs the foregoing operations of methods
in combination with hardware of the processor 1402.
[0185] A person of ordinary skill in the art may understand that,
all or some of the foregoing embodiments may be implemented by
using software, hardware, firmware, or any combination thereof.
When software is used to implement the embodiments, all or some of
the embodiments may be implemented in a form of a computer program
product. The computer program product includes one or more computer
instructions. When the computer program instructions are loaded and
executed on a computer, all or some of the procedures or functions
according to the embodiments of the present invention are
generated. The computer may be a general purpose computer, a
dedicated computer, a computer network, or another programmable
apparatus. The computer instructions may be stored in a
computer-readable storage medium or may be transmitted from one
computer-readable storage medium to another computer-readable
storage medium. For example, the computer instructions may be
transmitted from one website, computer, server, or data center to
another website, computer, server, or data center in a wired (for
example, a coaxial cable, an optical fiber, or a digital subscriber
line (DSL)) or wireless (for example, infrared, radio, or
microwave) manner. The computer-readable storage medium may be any
usable medium accessible by a computer, or a data storage device,
such as a server or a data center, integrating one or more usable
media. The usable medium may be a magnetic medium (for example, a
floppy disk, a hard disk, or a magnetic tape), an optical medium
(for example, a DVD), a semiconductor medium (for example, a solid
state disk Solid State Disk (SSD)), or the like.
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